Fuel control device, fuel control system using the device and method of making the device

Abstract

A fuel control device, system using the device and method of making the same are provided, the device comprising a housing having a passage therethrough for interconnecting a fuel source with a main burner, a throttle valve unit disposed in the passage for throttling fuel flow through the passage to the burner, and a selector operatively interconnected to the throttle valve unit to operate the same, the throttle valve unit comprising a pair of members one of which is substantially stationary and the other of which is rotatable relative to the one member, the one member having a face and having an aperture interrupting the face thereof and passing therethrough, the other member having a face disposed in sliding engagement with the face of the one member for controlling the effective opening of the aperture for fuel flow therethrough, the selector being operatively interconnected to the other member to rotate the same relative to the one member and thereby control the flow of fuel through the passage, the other member having an opening interrupting the face thereof and being adapted to overlap the aperture in various positions therewith for controlling fuel flow therethrough, the other member comprising a plug valve member.

What is claimed is: 
     
       1. In a fuel control device comprising a housing means having a passage therethrough for interconnecting a fuel source with a main burner means, a throttle valve means disposed in said passage for throttling fuel flow through said passage to said burner means, and selector means operatively interconnected to said throttle valve means to operate the same, said throttle valve means comprising a pair of members one of which is substantially stationary and the other of which is rotatable relative to said one member, said one member having a face and having aperture means interrupting said face thereof and passing therethrough, said other member having a face means disposed in sliding engagement with said face of said one member for controlling the effective opening of said aperture means for fuel flow therethrough, said selector means being operatively interconnected to said other member to rotate the same relative to said one member and thereby control the flow of fuel through said passage, said other member having an opening interrupting said face means thereof and being adapted to overlap said aperture means in various positions therewith for controlling said fuel flow therethrough, the improvement wherein said other member comprises a generally conical plug valve member having by-pass port means interrupting said face means thereof in spaced relation to said opening thereof, said plug valve member having an axis of rotation and having an end surface disposed substantially transverse to said axis, said end surface comprising said face means thereof, said one member having a by-pass port means interrupting said face thereof and being in communication with said by-pass port means of said valve member in substantially all operating positions of said valve member relative to said one member. 
     
     
       2. A fuel control device as set forth in claim 1 wherein said opening of said plug valve member is offset relative to said axis of rotation thereof. 
     
     
       3. A fuel control device as set forth in claim 2 wherein said end surface of said plug valve member is substantially flat and said face of said one member is substantially flat. 
     
     
       4. A fuel control device as set forth in claim 1 wherein said plug valve member has a by-pass passage leading to said by-pass port thereof for providing a by-pass flow of fuel from said source to said burner means, said plug valve member having a by-pass adjusting key disposed in said by-pass passage for controlling the by-pass flow of fuel therethrough. 
     
     
       5. A fuel control device as set forth in claim 4 wherein said plug valve member has a portion thereof that closes said passage of said housing means when said plug valve member is disposed in an "off" position thereof, said opening of said plug valve member being out of communication with said aperture means of said one member when said plug valve member is in said "off" position thereof. 
     
     
       6. A fuel control device as set forth in claim 1 wherein said aperture means of said one member and said opening of said plug valve member are so constructed and arranged that the fuel flow rate therethrough changes exponentially for linear changes in rotation of said plug valve member relative to said one member by said selector means. 
     
     
       7. A fuel control device as set forth in claim 1 wherein said aperture means in said face of said one member defines a groove in said face that has opposed ends and an opening that passes completely through said one member, said opening of said one member comprising one of said opposed ends of said groove. 
     
     
       8. A fuel control device as set forth in claim 7 wherein said groove increases in size from the other of said opposed ends thereof to said one of said opposed ends thereof. 
     
     
       9. A fuel control device as set forth in claim 8 wherein said groove has substantially a square transverse cross-sectional configuration. 
     
     
       10. A fuel control device as set forth in claim 7 wherein said groove is arcuate between said opposed ends thereof. 
     
     
       11. A fuel control device as set forth in claim 10 wherein said plug valve member has an axis of rotation, said groove being substantially radially disposed from said axis throughout the length of said groove. 
     
     
       12. A fuel control device as set forth in claim 11 wherein said opening of said plug valve member is offset relative to said axis and is movable along said groove in alignment therewith. 
     
     
       13. A fuel control device as set forth in claim 1 wherein said throttle valve means comprises a spring means carried by said housing means and acting on said one member to tend to force said face of said one member against said face means of said plug valve member. 
     
     
       14. A fuel control device as set forth in claim 13 wherein said spring means comprises a compression spring. 
     
     
       15. A fuel control device as set forth in claim 1 wherein said opening of said plug valve member is substantially circular. 
     
     
       16. A fuel control device as set forth in claim 1 wherein said one member is formed of polymeric material.